[PATCH 17/28] spi: fsl-espi: avoid processing uninitalized data on error

Arnd Bergmann
2016-10-17T22:13:38Z

When we get a spurious interrupt in fsl_espi_irq, we end up
processing four uninitalized bytes of data, as shown in this
warning message:

drivers/spi/spi-fsl-espi.c: In function 'fsl_espi_irq':
drivers/spi/spi-fsl-espi.c:462:4: warning: 'rx_data' may be used uninitialized in this function [-Wmaybe-uninitialized]

This adds another check so we skip the data in this case.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/spi/spi-fsl-espi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 7451585..2c175b9 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -458,7 +458,7 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)

mspi->len -= rx_nr_bytes;

- if (mspi->rx)
+ if (rx_nr_bytes && mspi->rx)
mspi->get_rx(rx_data, mspi);
}

--
2.9.0